package com.scau.config;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Component
public class AuthenticationIntercepter implements HandlerInterceptor{
	@Override 
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) 
            throws Exception { 
			HttpSession session = request.getSession();
			String role=(String)session.getAttribute("role");
			if(role == "teacher" || role == "admin"){
				return true;
			}else{
				response.sendRedirect("/html/lanjie.html");
				return false;
			}
        	// 只有返回true才会继续向下执行，返回false取消当前请求 
    } 

    @Override 
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, 
                           ModelAndView modelAndView) throws Exception { 
//        System.out.println(">>>MyInterceptor1>>>>>>>请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）"); 

    } 

    @Override 
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) 
            throws Exception { 
//        System.out.println(">>>MyInterceptor1>>>>>>>在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）"); 
    } 

}
